Method of forming body blanks for rip strip can bodies



1949- J. F. EGENOLF EI'AL METHOD OF FORMING BODY BLANKS FOR RIP STRIP CAN BODIES Filed May 15, 1945 v INVENTORS FZf'yena/j' and Ee'rna-rd 1152 Jo: coZ

into sections for forming body blanks.

Patented Aug. 30, 1949 METHOD OF FORMING BODY BLANKS FOR RIP STRIP CAN BODIES Jacob F. Egenolf, Pelham, and Bernard D. Bloser, Scarsdale, N. Y., assignors to Continental Can Company, Inc., New York, N. Y., a corporation of New York Application May 15, 1945, Serial No. 593,926

The invention relates to new and useful improvements in a method of making body blanks for can bodies, having score lines setting off a tear strip and a projecting integral tongue to which a key may be attached for removing the tear strip when it is desired to open the can.

An object of the invention is to provide a method of severing a metal sheet so as to provide finished can body blanks having integrally projecting tongue with the least possible waste of material.

A further object of the invention is to provide a method of forming body blanks from a continuous strip by straight line cutting and scroll cutting, followed by slitting and trimming so that finished can body blanks having projecting integral tongues can be produced with a minimum number of operations and the least amount of waste material.

In the drawings:

Figure 1 is a view of a coil strip showing in broken lines the manner of cutting the coil strip to produce sheets therefrom which are properly dimensioned for the forming of body blanks therefrom by the improved method;

Figure 2 is an enlarged view of a sheet formed from the coil strip by the straight line cutting of the same indicated in Figure 1;

Figure 3 is an enlarged view of one of the sections cut from the sheet in Figure 2 from which a single body blank is to be trimmed;

Figure 4 shows the body blank at the scroll edge trimmed so as to provide the integrally projecting tongue and the parts which are to be folded to form the hooks for the joining of the ends into a side seam for the can body;

Figure 5 is a view showing the hooks formed at the integral tongue end of the body blank;

Figure 6 is a detail upper edge View of the portion of the body blank shown in Figure 5.

Referring to Figure 2, there is shown a sheet of metal wherein the sides and ends have been squared preparatory to the cutting of the sheet This sheet as shown in Figure 2, may be furnished by the mill or the sheet may be produced from a coil strip. As illustrated in the drawings, the sheet is formed from a coil strip indicated at l, by cutting the strip along the lines 2-2 and 3-3. After the sheet which is designated at 4 in the drawings has been cut from the coil sheet or received from the mill, it is scroll out along the lines 55. This sheet is dimensioned so that two can body blanks may be formed from each section produced by the scroll line out 5-5. The sheet, of course, could be of a greater width 3 Claims. (01. 164 17) so that three or more can body blanks can be cut from each section of the sheet formed by the scroll cutting.

The length of the sheet is such that when it is scroll out along the line 55, each section will be of proper dimensions so that body blanks with projecting integral tongues can be formed therefrom. In the scroll cutting of the sheet 4 the section fla will be provided with a scroll projection 6 and a recess 1. When the sheet is of a width for forming two body blanks from each section, there will be two scroll projections 66 and two recesses 1-1.

This cutting of the sheet to form a section 40. with a scroll projection and recess also produces a section 4b wherein there are similar projections and similar recesses. The scroll projection 6 on the section 4a produces the recess in the section 4b and likewise, the scroll projection on the section 4b forms the recess 1 on the section do. After having scroll-cut the sheet 4 so as to provide the two sections 40, and 4b, each section is then slit along the line 8-8 so that from each section there is produced two metal parts of proper dimensions for forming a body blank therefrom. One of these parts is indicated at 9, in Figure 3, and may be termed a preliminary blank from which the finished can body blank is formed.

This metal part 9 has a width equal to the height of the can body. The bottom end of the can body i-sindicated by the line [0 and the top end ofthe can body is indicated by the line II.

The scroll end of this part 9 is next out along the dot and dash line |2-I2 and also along the dot and dash lines l3l3 which form the tearing tongue, indicated at M. The trimmed end is shown in Figure 4. This trimming operation forms hooks for the side seam, the hook section above the tongue being indicated at l5, the hook section between the tongue and the recess 1 being indicated at l6, and the hook section between the recess 1 and the lower end of the can being indicated at IT. These hook sections are formed by bending the blank along the broken line l8.

In Figure 5 the hooks have been bent back upon the body in the usual way so they are ready to be interlocked with the usual hook formed at the opposite end of the can body. It is understood that the body blank is intended for what is well known as a lock and lap side seam. The lap portions, however, have not been indicated in the drawings in order to avoid confusion.

Before the trimming of the body blank, orat this figure. It will be noted that thi s sheet/ I whether it is furnished by the mill or madeirpm a coil strip, is severed by a. scroll out so as to provide two sections, each section aving e e age which is straight and the other scr d with the scrolled edge having alternately "arranged iirejections and notches of a similar size and shape in spaced relation and equidistant from the side edges of the body blanks to be formed from said section.

Said section is also dimensioned so that the w dth therein is 'eqtfai te the height er a body Blank 6r a multiple thereof, and the overall length oi the section at the aten projection is fqii al fo tlfe lengtlh of "a finished can hody blank s'tr'fpfat the eaten recess is equal to the length oiffa finished body blahk regs the lengt or the body Hook The length or the tongue wherever referre to that portion'of the tongue extendhfg heye'hu the ie crg' 6'; th body blank. It win nst be noted that the inner edge of the recess 1 is eetfietaeht to the bend line of the "can body hooks. p v M It is from this section or metal formed b this retell "cutting and slitting of: the sheet that the heat blanks are te med. The number'ef thereti or'is for "forming the they pranks hem "the sheet has been reduced to hiirium. The first 'op'- trench is a "stat on out, the-next operation is sittthis "and transverse "straight line cutting where "a s,-

coil strip is hein ep erated upon and the third operation die trimming, noto'hiiig, and scoring, and what might be called 'it "fllfth operation is the'hehaih of the hooks which maybeperforifred int-She sahie o eration *as the'trimm'in'g.

In tfe usual commercial method of rornhhg can "b'od'y blanks, each body blank is separltew formed and mttsthe from a'sheet'of thethi, which equals the length of the finished "body pitch; this 'the ihgth'ef the tongue minus 'the width .of a hook. Applicant, by the improved method described above reduces the "amount of waste to'a minimumas the Flerigth of the "sheet ffor forming two can fb'o'd'y "blanks 'end to "end one body hook. "Ithasben proposed tocut two body blanks froiii asheet end to end with the tonguesoftlie'twoblanks staggered. This would be a "considerable saving "of material "over the fcortimercial method referred to above. By this "proposed th'eth'edth 'waste meterta rs er a width at leasteiiual to the length o f h'tongiieless tli'e wldth ofoziehook'as the tongue 'is'cut' solely froi'n this waste material. By the inethoddescribed p p 'length of "one finished "can body blank less the "abdi'r'e and set forthin the there is "a marked additional saving of m aterial lhe w ite iniritt'rf' tlbetween:tlieendsbfjtliebltihks "is equai totheleng'thbfthe gh iess thet dth of the eeretthqftherettre,jiiy thiemetrics-otter jtlie proposed niethod'thfe isfasaviii'g a -nest pits the length a; e tongue. The length er the 4 and projecting tongue the saving is very material.

While the method has been described as consisting in scroll cutting a sheet having straight parallel ends, the method may be equally applied to the scroll cutting of the coil strip along the lines Z'lT-fljl and 2l--2"l-, thus forming a sheet, each end Yi'f which is scroll out. In 'sucha carrying out of the method, the sheet thus formed would be slit along the line 3--3 centrally thereof, thus formin gsections of the sheet which, when sl'it gwolild form the parts 9 from which the body blanks are produced, with the same saving of metal. It is obv at minor changes in the steps of the me o be made without departing from appended iclai'r'ns.

We,,claim:

l. The method of making a sheet metal can body blank for a can having a tearing strip and an ihtegtant projecting tongue, eeihprrerhg refinif; a metal by scifen cutting the ehge "tn-sheer "in a single cutting operation straight 'cuttihg 'the other edge ina single cutting "there'- tio'n so "that the metal section has two gerfefa il'y parallel edges "at right angles totfie side eases thereof, said Scroll edge havin hiterriateiy arranged projections and recesses 'of artist triage-ape inspeicedrelatidn'and quidisfi nt from the "side edges or the pett 'hihnhs to he rennet {reinstate metal section, said metal section bein dimensioned so that the Widththeror is eduai "to the heigntor' a they blank or a ih'uItipTe triemor and the "overall "length of theunetal section at "the scrollprojections-equalte'theprinters-finishes can body "blank plus the length or a tongue, and the length er the strip at thescroll recess is equal to the length of one finished canbody bla-nk less the length of one body hook, the inner edge of thehr'eces's formedby the-scroll cut-being coincirdent to "the bend line of the can body hooks, slitt'nrg said metal section into preliminary body blanks, trimming the scroll ed'g'e of the preliminary blank so as to providea 'finishedcan'bod'y bla'ril :"a'rn:i provide a projecting tongue from "the scroll proj 'tcti-on of the preliminaryblank.

2. The methcidof nfakirig a "sheet metal can body blank for'a can'h'aving a tearing strip and :an integrally projecting tongue fcomprising cutting a coil strip so as to provide 'a sheet with straight parallel ends; subsequently scroll putting said sheet midway between its ends in a single cuttingoperationsotas to provide two meta-15sections of the same size, each having a -straight edge and a scroll edge, said scroll edge having alternately arranged projections and recesses of similar size and jshape in "spaced 'x elation and equidistant frormthe sideedg'esof thebodyblahks to be formewfrom-saidmtals'ection,said metal 6 fsection being dimensioned so that the overall rlengthof"themetalsectionattl'ie scroll proiection isequal'tothelength'of aflnished'canbcdyblank 'phis thelengthdfa tongueand'thelerigth' of the *nle'tal section "at the scroll recess is equal to the length "of "one biiiiyhdolr, the inner edge of the recess fornied by the-scroll out being coincident to'thie bnd llne of-thecahb odyhool's, slitting said metaiseetteh into preliminary body mains, fbrniing the scroll ease or thepfehthihatybiahk so to pioviaea finished can they biahirahd'aiso pro- "v'ide apriijicting torigiie from'tife seniirpiojeetihh "orthe pfeh haryhiafik.

5 an integrally projecting tongue comprising scroll cutting a coil strip so as to provide a sheet with generally parallel ends, subsequently cutting said sheet on a straight line midway between its ends so as to provide two metal sections of the same size, each section having a straight edge and a scroll edge, said scroll edge having alternately arranged projections and recesses of similar size and shape in spaced relation and equidistant from the side edges of the body blanks to be formed from said metal section, said metal section being dimensioned so that the overall length of the metal section at the scroll projection is equal to the length of a finished can body blank plus the length of a tongue and the length of the metal section at the scroll recess is equal to the length of one finished can body blank less the length of one body hook, the inner edge of the recess formed by the scroll out being coincident to the bend line of the can body hooks, slitting said metal section into preliminary body blanks, forming the scroll edge of the preliminary blank so as to provide a finished can body blank and also provide a projecting tongue from the scroll projection of the preliminary blank.

JACOB F. EGENOLF. BERNARD D. BLOSER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

